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Search: id:A000979
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| A000979 |
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Primes of form (2^p + 1)/3.
(Formerly M2896 N1161)
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+0
21
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| 3, 11, 43, 683, 2731, 43691, 174763, 2796203, 715827883, 2932031007403, 768614336404564651, 201487636602438195784363, 845100400152152934331135470251, 56713727820156410577229101238628035243, 62357403192785191176690552862561408838653121833643
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OFFSET
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1,1
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COMMENT
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a(n) are the Wagstaff primes. a(n) are the primes with prime indices in the Jacobsthal sequence A001045[n]. Numbers n such that (2^n + 1)/3 is prime are listed in A000978[n] = {3,5,7,11,13,17,19,23,31,43,61,...}. - Alexander Adamchuk (alex(AT)kolmogorov.com), Oct 03 2006
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
Editor's Note, Math. Mag., 27 (1954), 157.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..20
C. Caldwell's The Top Twenty, Wagstaff.
S. S. Wagstaff, Jr., The Cunningham Project.
Wikipedia, Wagstaff prime.
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CROSSREFS
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Cf. A000978, A049883, A001045, A127962.
Sequence in context: A051257 A135482 A126614 this_sequence A123628 A153476 A107290
Adjacent sequences: A000976 A000977 A000978 this_sequence A000980 A000981 A000982
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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